CN219492613U

CN219492613U - Centrifugal circulating gas compressor

Info

Publication number: CN219492613U
Application number: CN202320742811.3U
Authority: CN
Inventors: 刘有光; 佟玲; 孔凡一; 顾笑铭; 李昂; 陈博; 王艳; 杨佳; 杨旭亮; 张伟; 王芹; 曹德臣; 姜雷; 任红达; 闫刚; 田春野
Original assignee: Jinxi Chemical Machinery Group Co ltd
Current assignee: Jinxi Chemical Machinery Group Co ltd
Priority date: 2023-04-07
Filing date: 2023-04-07
Publication date: 2023-08-08
Anticipated expiration: 2033-04-07

Abstract

The utility model provides a centrifugal circulating gas compressor. Comprises a motor, a speed increaser and a compressor host; the motor is in transmission connection with the compressor main machine through a speed increaser and is located on the base, and a high-level oil groove is arranged beside the base and is connected with the compressor main machine; the main machine of the compressor is a one-section two-stage compression structure and comprises a cylinder body, a main shaft of the compressor, an impeller, a wheel cover gas seal, an interstage gas seal, a baffle plate, a bearing box, a cylinder liner, a dry gas seal, a shaft end seal, a bearing and an end cover. The main machine of the compressor is of a horizontal split structure, two ends of an inner cavity are provided with end cover seals, and a bearing box with a bearing is hung outside the end cover to form a supporting point of a main shaft of the compressor; and a high-order oil groove is arranged beside the base and is used as an emergency treatment system, and when the on-site power-off or emergency stop of the oil pump fault unit is carried out, the oil supply to the unit bearing is continued through the high-order oil groove, so that the emergency risk avoidance is carried out. The centrifugal circulating gas compressor is suitable for being used as a centrifugal circulating gas compressor.

Description

Centrifugal circulating gas compressor

Technical Field

The utility model relates to equipment on a dichloroethane production line in the field of chemical machinery, in particular to a centrifugal circulating gas compressor.

Background

With the development of chlor-alkali industry, the chlorine productivity of China is gradually excessive, and in order to consume the excessive chlorine, other chlorine consumption products such as epichlorohydrin, chloroacetic acid, methane chloride and the like are also gradually put into operation besides the polyvinyl chloride products, wherein dichloroethane is a good product for consuming the chlorine. In the dichloroethane production device, the compressor is used for carrying out pressurized conveying on chlorine, hydrogen chloride and recycle gas so as to meet the requirement of the optimal process synthesis reaction.

The dichloroethane production plant generally uses a reciprocating circulating gas compressor, a. The reciprocating compressor has overall efficiency lower than that of a centrifugal compressor due to its small displacement and pulsation of the gas flow;

b. the centrifugal circulating gas compressor has stable operation, reliable operation, less friction parts and low failure rate, so that the spare parts are less in consumption, the maintenance cost and personnel are less, and the advantages are superior to those of the reciprocating compressor; the reciprocating compressor has the advantages of more moving parts, complex structure, large maintenance workload and high maintenance cost;

c. the largest soft rib of the reciprocating compressor is the abrasion of a piston ring, the abrasion of a cylinder and the transmission mode of a belt, so that the efficiency of a unit is quickly reduced, and the centrifugal compressor can maintain the stable compression efficiency for a long time, which cannot be achieved by the reciprocating compressor;

d. in the chemical process, the centrifugal compressor can realize an absolute oil-free compression process for chemical media.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, it is an object of the present utility model to provide a centrifugal recycle gas compressor. The main engine of the compressor is of a single-cylinder one-section two-stage structure, adopts a horizontal split type, and solves the technical problems of gas pressurization and energy conservation through continuous pressurization of the first stage and the second stage.

The utility model solves the technical problems by adopting the scheme that:

a centrifugal circulating gas compressor comprises a motor, a speed increaser and a compressor main machine; the motor is in transmission connection with the compressor host through a speed increaser and is located on a base, and a high-level oil groove is arranged beside the base and is connected with the compressor host 3;

the main machine of the compressor is of a one-section two-stage compression structure and comprises a cylinder body, a main shaft of the compressor, an impeller, a wheel cover gas seal, an interstage gas seal, a baffle plate, a bearing box, a cylinder liner, a dry gas seal, a shaft end seal, a bearing and an end cover;

the lower part of the cylinder body is provided with an air inlet chamber and an exhaust chamber, two ends of the inner cavity of the cylinder body are provided with end covers, a cylinder liner is arranged between the two end covers, bearing boxes are arranged at the outer sides of the two end covers, bearings are arranged in the bearing boxes, two ends of a main shaft of the compressor are arranged in the bearings, an impeller is assembled in the middle part of the main shaft of the compressor to form a rotor, the impeller comprises a primary impeller and a secondary impeller, the primary impeller and the secondary impeller are arranged between two partition boards, a wheel cover gas seal is arranged between the impeller and the partition boards, a blade structure is arranged on the partition boards, an inlet flow director is arranged at the inlet of the impeller, a blade runner is arranged on a blade of the impeller, two partition boards at the outlet of the impeller form a diffuser for gas compression, and a bend, a blade diffuser and a reflux device are arranged at the outlet of the first section; an interstage gas seal is arranged between the first stage and the second stage, so that gas is sucked from the center of the impeller and enters the volute to an outlet of the exhaust chamber along a passage between the blades; the main shaft of the compressor is a stepped shaft, dry gas seals are arranged at two ends of the main shaft, and shaft end seals are assembled at the inner sides of the end covers.

In order to further solve the technical problem to be solved, the cylinder body provided by the utility model is of a horizontal split structure, the two ends of the inner cavity are provided with end covers for sealing, and a bearing box with a bearing is hung outside the end covers to form a supporting point of a main shaft of the compressor.

Further, the high-level oil tank is used as an emergency treatment system, and an oil supply port and an oil return port are arranged on the high-level oil tank, wherein the oil supply port is connected with an oil inlet of a main engine of the compressor, and the oil return port is connected with an oil outlet; and when the on-site power is cut off or the oil pump fails and the unit suddenly stops, the oil is continuously supplied to the unit bearings through the high-order oil grooves.

The main machine of the compressor has the advantages that as the main machine of the compressor is of a horizontal split structure, the two ends of the inner cavity are provided with the end covers for sealing, and the bearing box with the bearing is hung outside the end covers to form the supporting point of the main shaft of the compressor; and a high-order oil groove is arranged beside the base and is used as an emergency treatment system, and when the on-site power-off or emergency stop of the oil pump fault unit is carried out, the oil supply to the unit bearing is continued through the high-order oil groove, so that the emergency risk avoidance is carried out. The compressor main engine is continuously pressurized through a section of two-stage impeller, and through the selection and the arrangement of the sealing piece, the leakage of hydrogen sulfide gas is stopped, the efficiency is improved, the technical problems of circulating gas pressurization and circulating gas leakage avoidance are solved, and the energy-saving purpose is achieved. The centrifugal circulating gas compressor is suitable for being used as a centrifugal circulating gas compressor.

Drawings

FIG. 1 is a front view of the present utility model;

FIG. 2 is a top view of the present utility model;

FIG. 3 is a side view of the present utility model;

FIG. 4 is a schematic view of a high-level oil sump structure;

FIG. 5 is a single stage compression partial view of a compressor host;

fig. 6 is a longitudinal sectional view of the compressor main body.

In the drawings, 0.base, 1.motor, 2.speed increaser, 3.compressor main unit, 3.1 oil inlet, 3.2 oil outlet, 4 inlet chamber, 5 exhaust chamber, 6 inlet deflector, 7 impeller, 8 wheel cover gas seal, 9 vane flow channel, 10 diffuser, 11 bend, 12 vane diffuser, 13 reflux, 14 interstage gas seal, 15 thrust bearing, 16 end cover, 17 radial bearing, 18 partition, 19 volute, 20 first stage impeller, 21 cylinder liner, 22 second stage impeller, 23 shaft end seal, 24 dry gas seal, 25 compressor main shaft, 26 cylinder body, 27 bearing box, 28 high position oil groove, 28.1 oil supply port, 28.2 oil return port.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in the figure, a centrifugal circulating gas compressor comprises a motor 1, a speed increaser 2 and a compressor main machine 3; the motor 1 is in transmission connection with the compressor host 3 through the speed increaser 2 and is located on the base 0, and a high-level oil groove 28 is arranged beside the base 0 and is connected with the compressor host 3;

the compressor main machine 3 is of a one-stage two-stage compression structure and comprises a cylinder body 26, a compressor main shaft 25, an impeller 7, a wheel cover gas seal 8, an interstage gas seal 14, a partition plate 18, a bearing box 27, a cylinder liner 21, a dry gas seal 24, a shaft end seal 23, a bearing and an end cover 16;

the lower part of the cylinder 26 is provided with an air inlet chamber 4 and an exhaust chamber 5, two ends of the inner cavity of the cylinder 26 are provided with end covers 16, a cylinder liner 21 is arranged between the two end covers 16, a bearing box 27 is arranged at the outer sides of the two end covers 16, a bearing is arranged in the bearing box 27, two ends of a main shaft 25 of the compressor are arranged in the bearing, an impeller 7 is arranged in the middle part of the main shaft 25 of the compressor to form a rotor, the impeller 7 comprises a primary impeller 20 and a secondary impeller 22, the primary impeller 20 and the secondary impeller 22 are arranged between two partition plates 18, a wheel cover air seal 8 is arranged between the impeller 7 and the partition plates 18, a blade structure is arranged on the partition plates 18, an inlet flow director 6 is arranged at the inlet of the impeller 7, a blade runner 9 is arranged on a blade of the impeller 7, two side partition plates 18 are arranged at the outlet of the impeller 7 to form a diffuser 10 for gas compression, and a curve 11, a blade diffuser 12 and a reflux 13 are arranged at the outlet of the first section; an interstage gas seal 14 is provided between the first and second stages such that gas is drawn from the centre of the impeller 7, along the passage between the vanes into the volute 19 to the outlet of the discharge plenum 5; the compressor main shaft 25 is a stepped shaft, and is provided with dry gas seals 24 at both ends, and shaft end seals 23 are provided inside the end cover 16 to prevent mixing of external gas and harmful gas and leakage of harmful gas.

In order to ensure the stability of the structure of the utility model, the high-level oil tank 28 is used as an emergency treatment system, and an oil supply port 28.1 and an oil return port 28.2 are arranged on the high-level oil tank 28, wherein the oil supply port 28.1 is connected with an oil inlet 3.1 of a compressor main unit 3, and the oil return port 28.2 is connected with an oil outlet 3.2; when the on-site power is off or the oil pump fails and the unit suddenly stops, the oil is continuously supplied to the unit bearings through the high-level oil groove 28, and the oil supply can be continuously carried out for 8 minutes in the embodiment; the oil station of the reciprocating circulating gas compressor must be provided with a set of standby power supply, so that the damage of a unit caused by the power failure of the system is avoided, and the cost is high.

In order to further ensure the stability of the structure of the utility model, the cylinder body 26 is of a horizontal split structure, the two ends of the inner cavity are provided with end covers 16 for sealing, and a bearing box 27 with a bearing is hung outside the end covers to form a supporting point of the main shaft 25 of the compressor. In the present embodiment, the bearing housing 27 is provided outside the cylinder block 26 to facilitate assembly of the compressor main shaft 25.

In order to optimize the structure of the utility model, nitrogen is introduced into the dry gas seals 24 at the two ends of the main shaft 25 of the compressor, so as to prevent the mixing of external gas and harmful gas and the leakage of the harmful gas.

The inner cavity of the cylinder body 26 is provided with a sensor for monitoring the vibration and displacement of the main shaft 25 of the compressor, the main shaft 25 of the compressor is provided with a shaft vibration probe, and the sensor signals are transmitted to the DCS system, so that the running condition of the unit can be conveniently observed.

In order to more optimize the structure of the present utility model, the bearing is a combination bearing comprising a thrust bearing 15 and a radial bearing 17.

The thrust bearing 15 adopts a double-sided Jin Siba thunder-shaped bearing with a nozzle and has an automatic aligning function, and the direct lubrication is adopted, so that the cooling effect of the bearing is improved, and the lubrication oil quantity and mechanical friction loss are reduced. The oil nozzle can also play a role in safety protection when the tile is burnt.

The radial bearings 17 are five tilting pad bearings with oil nozzles for direct lubrication, and each group of bearings is provided with two pads embedded with a temperature detector.

In order to optimize the structure of the utility model, the thrust bearing 15 and the radial bearing 17 are provided with temperature measuring thermal resistors, which can measure the temperature of the bearing;

alternatively to the conventional technique, the horizontal joint surface of the partition 18 is provided with an O-ring seal, and a labyrinth seal is employed.

When the device works, gas enters the air inlet chamber 4 at the lower part of the cylinder 26, enters the primary impeller 20 through the inlet flow director 6, flows through the diffuser 10, the bend 11 and the reflux 13, the speed is reduced, the pressure is further improved, namely, the kinetic energy is converted into pressure energy; then into the secondary impeller 22 for further compression and finally into the volute 19 to the discharge plenum 5 for delivery of the gas to the reflux cooler.

In the embodiment, the flow rate of the unit is 7600Nm3/h, the inlet pressure is 2.9MPa (A), the outlet pressure is 5.9MPa (A), and the technical parameters are as follows: model MCL372.

The working process of the utility model comprises the following steps:

the low-pressure circulating gas before compression is input into the air inlet chamber 4 through the air inlet, the circulating gas enters the secondary impeller 22 after being compressed by the primary impeller 20, is continuously compressed by the secondary impeller 20, and is discharged to a section of outlet through the outlet volute 19, so that the compression process of the gas in the unit is completed.

The utility model is characterized in that:

because of the horizontal split structure, the two ends of the inner cavity are provided with end cover seals, and the bearing box with the bearing is hung outside the end cover, so that the assembly is convenient, and the production efficiency is improved;

the cylinder body adopts a cylinder structure, and two ends of the cylinder body adopt an inner end cover and an outer end cover to form an integrated parting surface-free structure; meanwhile, the two ends of the main shaft of the compressor adopt dry gas sealing technology, the horizontal joint surfaces of all the stages are provided with O-shaped sealing rings to adopt labyrinth sealing, and rubber sealing strips are arranged on the middle split surfaces of the gas compression cylinder and the partition plate member, so that no gas leakage can be ensured. And when the on-site power-off or emergency stop of the oil pump fault unit is performed, the oil is continuously supplied to the unit bearing for 8 minutes through the high-level oil tank.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims

1. A centrifugal circulating gas compressor is characterized in that:

comprises a motor (1), a speed increaser (2) and a compressor main machine (3); the motor (1) is in transmission connection with the compressor main machine (3) through the speed increaser (2) and is located on the base (0), and a high-level oil groove (28) is arranged beside the base (0) and is connected with the compressor main machine (3);

the compressor main machine (3) is of a one-stage two-stage compression structure and comprises a cylinder body (26), a compressor main shaft (25), an impeller (7), a wheel cover gas seal (8), an interstage gas seal (14), a baffle plate (18), a bearing box (27), a cylinder liner (21), a dry gas seal (24), a shaft end seal (23), a bearing and an end cover (16);

an air inlet chamber (4) and an air outlet chamber (5) are arranged at the lower part of a cylinder body (26), end covers (16) are arranged at two ends of an inner cavity of the cylinder body (26), a cylinder liner (21) is arranged between the two end covers (16), a bearing box (27) is arranged at the outer sides of the two end covers (16), a bearing is arranged in the bearing box (27), two ends of a main shaft (25) of a compressor are arranged in the bearing, an impeller (7) is arranged in the middle part of the main shaft (25) of the compressor to form a rotor, the impeller (7) comprises a primary impeller (20) and a secondary impeller (22), the primary impeller (20) and the secondary impeller (22) are arranged between two partition boards (18), a wheel cover air seal (8) is arranged between the impeller (7) and the partition boards (18), a blade structure is arranged on the partition boards (18), an inlet flow guide (6) is arranged at the inlet of the impeller (7), a blade runner (9) is arranged on a blade of the impeller (7), two side partition boards (18) are arranged at the outlet of the impeller (7) to form a diffuser (10) for air compression, and a bend (11), a blade diffuser (12) and a reflux diffuser (13) are arranged at the outlet of the first section; an interstage gas seal (14) is arranged between the first stage and the second stage, so that gas is sucked from the center of the impeller (7), enters the volute (19) along a passage between the blades and is discharged from the exhaust chamber (5); the main shaft (25) of the compressor is a stepped shaft, dry gas seals (24) are arranged at two ends of the main shaft, shaft end seals (23) are arranged on the inner side of the end cover (16), and the main shaft has the effects of preventing the mixing of external gas and harmful gas and the leakage of the harmful gas.

2. A centrifugal cycle gas compressor according to claim 1, wherein:

the high-level oil tank (28) is used as an emergency treatment system, an oil supply port (28.1) and an oil return port (28.2) are arranged on the high-level oil tank (28), wherein the oil supply port (28.1) is connected with an oil inlet (3.1) of a compressor main engine (3), and the oil return port (28.2) is connected with an oil outlet (3.2); and when the on-site power is cut off or the oil pump fails and the unit suddenly stops, the oil is continuously supplied to the unit bearings through the high-level oil groove (28).

3. A centrifugal cycle gas compressor according to claim 1, wherein:

the cylinder body (26) is of a horizontal split structure, end covers (16) are arranged at two ends of the inner cavity and are sealed, and a bearing box (27) with a bearing is hung outside the end covers to form a supporting point of the main shaft (25) of the compressor.

4. A centrifugal cycle gas compressor according to claim 1, wherein:

the dry gas seals (24) at two ends of the main shaft (25) of the compressor are filled with nitrogen, so that the effects of mixing external gas and harmful gas and leakage of the harmful gas are prevented;

the inner cavity of the cylinder body (26) is provided with a sensor for monitoring vibration and displacement of the main shaft (25) of the compressor, the main shaft (25) of the compressor is provided with a shaft vibration probe, and the sensor signals are transmitted to the DCS system, so that the running condition of the unit can be conveniently observed.

5. A centrifugal cycle gas compressor according to claim 1, wherein:

the bearing is a combined bearing and comprises a thrust bearing (15) and a radial bearing (17);

the thrust bearing (15) adopts a double-sided Jin Siba thunder-type bearing with a nozzle and has an automatic aligning function;

the radial bearings (17) are five tilting pad bearings with oil nozzles for direct lubrication, and each group of bearings is provided with two pad embedded thermometers.

6. A centrifugal cycle gas compressor according to claim 5, wherein:

the thrust bearing (15) and the radial bearing (17) are provided with temperature measuring thermal resistors, and can measure the temperature of the bearing.

7. A centrifugal cycle gas compressor according to claim 1, wherein:

an O-shaped sealing strip is arranged on the horizontal joint surface of the partition plate (18), and labyrinth sealing is adopted.